The distribution of metates through the deposit was not as random as that of manos. Many of the complete specimens occur among features or with burials. Fragments were encountered throughout the excavation, but were most highly concentrated in features consisting of large aggregates of stone. No depth table has been presented for metates, as it is assumed that the mano distribution reflects a more complete picture for these related tools; however, the deep-basin form seems to occur at the greatest depth. _Manos_ Manos and mano fragments were so common in the occupational debris that their association in features or with burials had little or no significance. With the exception of scraper planes they were the most frequent artifact group encountered. Their depth distribution (table 5) suggests several noteable points. The highest frequency occurs in the 6-to-12-inch level, being represented by some 349 examples. From 0-to-36-inches there are 960 specimens but from 36-to-54-inches there are only 2 examples. This would seem to indicate then that the early history of the Tank Site was characterized mainly by a flake-and-core industry with the mano-metate complex being exhibited only lightly at first and then gaining considerable importance toward the latter periods of Phase I. Excavations at LAn-2 would also indicate that the trait began to wane toward Phase II and was gradually replaced by a mortar-pestle complex, which continues to be characteristic on into historic times. Manos have been typed largely on the basis of the number of faces that exhibit wear, the nature of the worked or worn surfaces, and the general form. Some eight types have been recognized. Table 5 Mano Types